bishops oversee a diocese, some are consecrated to assist diocesan bishops in large or busy dioceses, and some are relieved of diocesan responsibilities so they can minister more widely (especially primates who concentrate on leading a member church of the Communion). A few member churches of the Anglican Communion ordain women as bishops, many more have prepared the legislation for women to become bishops but have not yet ordained a woman to the episcopate (see Ordination of women in the Anglican Communion). Anglican bishops are often identified by the purple clergy shirt and cassock they are entitled to wear. However, bishops are permitted to wear other colours, and a former Archbishop of Canterbury, Rowan Williams, is frequently seen wearing a black cassock. Bishops also usually wear a pectoral cross and episcopal ring. The choir dress or convocation habit for bishops, which used to be their only vesture until pre-Reformation vestments were revived, consists of the cassock, rochet, chimere and tippet. Bishops carry a crosier as the sign of their ministry, and, on formal occasions, often wear a mitre and cope. When presiding at the Eucharist, most Anglican bishops now wear albs, stoles and chasubles. Archbishop of Canterbury The Archbishop of Canterbury is the primus inter pares, or first among equals, of the Anglican Communion. Although he has no authority outside of the Church of England, he hosts and chairs the Lambeth Conference and Anglican Communion Primates' Meeting, and is president of the Anglican Communion Office. In this way, the Archbishop of Canterbury can be seen as being at the centre of the network of Anglican ministry. For many, being an Anglican means being in communion with the Archbishop of Canterbury. Primates Each member church of the Anglican Communion is an independent body headed by a primate. A primate is the most senior bishop of a member church. As well as being primus inter pares, the Archbishop of Canterbury is Primate of All England, the senior bishop in the Church of England. For historical reasons, the Church of England and the Church of Ireland (which is headed by the Archbishop of Armagh who is the Primate of All Ireland) also call their second most senior bishops primate: the Archbishop of York and the Archbishop of Dublin are the Primate of England and Ireland, without the All, respectively. Although some member churches of the Anglican Communion title their primates as Primate or